Income Taxes (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	32.90%	34.90%
U.S. federal statutory income tax rate	35.00%	35.00%
Anticipated reductions to unrecognized tax benefits within next twelve months	$ 0
Income Tax Examination, Penalties and Interest Accrued	$ 0